Get Heading

function getHeading()
    if(turtle.getFuelLevel() < 2) then
        error("Insufficient fuel")
    end
    local start = vector.new(gps.locate())
    while(turtle.detect()) do
        turtle.dig()
    end
    turtle.forward()
    local current = vector.new(gps.locate())
    turtle.back()
    if(start.z - current.z > 0) then
        heading = 'N'
    elseif (start.z - current.z < 0) then
        heading = 'S'
    end
    if(start.x - current.x > 0) then
        heading = 'W'
    elseif (start.x - current.x < 0) then
        heading = 'E'
    end
        return heading
end



print (getHeading())